NIO连接socket

NIO连接socket
早就听说JAVA的NIO比IO牛一些,可是牛在哪里一直都不知道,并且NIO比IO难学,搞了半天终于用NIO弄了两个程序,一个是服务器端,一个是客户端,都是用NIO连接的,代码如下,注释比较少,输出比较多:)

/*
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* and open the template in the editor.
*/
package testnio;

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.util.Set;

/**
*
* @author hadeslee
*/
public class Receive {

    public static void main(String[] args) throws Exception {
        boolean b = true;
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        ServerSocketChannel ss = ServerSocketChannel.open();
        ss.socket().bind(new InetSocketAddress(8888));
        ss.configureBlocking(false);
        Selector se = Selector.open();
        ss.register(se, SelectionKey.OP_ACCEPT);
        while (se.select() > 0) {
            Set<SelectionKey> set = se.selectedKeys();
            System.out.println("进入一个循环,大小是:" + set.size());
            for (SelectionKey key : set) {
                int ops = key.readyOps();
                System.out.println("ops=" + ops);
                if ((ops & SelectionKey.OP_ACCEPT) == SelectionKey.OP_ACCEPT) {
                    SocketChannel sc = ss.accept();
                    System.err.println("有新的连接了" + sc);
                    System.err.println("地址是:" + sc.socket());
                    sc.configureBlocking(false);
                    sc.register(se, SelectionKey.OP_READ);
                }
                if ((ops & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
                    System.err.println("有新的读取");
                    SocketChannel sc = (SocketChannel) key.channel();
                    System.out.println(sc.isConnected());
                    sc.read(buffer);
                    buffer.flip();
                    //System.out.println(new String(buffer.array()));
                    Thread.sleep(5000);
                    if (b) {
                        b = false;
                        sc.write(buffer);
                    }

                }
            }
            set.clear();
            System.out.println("退出循环");
        }

    }
}

客户端:

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package testnio;

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Set;

/**
*
* @author hadeslee
*/
public class Send {

    public static void main(String[] args) throws Exception {
        SocketChannel sc = SocketChannel.open();
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        Selector se = Selector.open();
        buffer.put("我是中国人,我爱我的祖国,hadeslee".getBytes());
        buffer.flip();
       
        sc.configureBlocking(false);
        sc.register(se, SelectionKey.OP_CONNECT | SelectionKey.OP_READ | SelectionKey.OP_WRITE);
        sc.connect(new InetSocketAddress("192.168.1.58", 8888));
        while(!sc.finishConnect());
        sc.write(buffer);
        System.out.println("进入循环");
        Thread.sleep(10000);
        int sum = se.select();
        while (se.select() > 0) {
            Thread.sleep(100);
              
                System.out.println("终于大于0了");
                Set<SelectionKey> set = se.selectedKeys();
                System.out.println("大小是:"+set.size());
                for (SelectionKey key : set) {
                    int ops = key.readyOps();
                    if ((ops & SelectionKey.OP_CONNECT) == SelectionKey.OP_CONNECT) {
                        sc.write(buffer);
                        System.out.println("连接成功");
                    }
                    if ((ops & SelectionKey.OP_READ) == SelectionKey.OP_READ) {
                        System.out.println(" 收到东西");
                        sc.read(buffer);
                        buffer.flip();
                        System.out.println("收到的是:" + new String(buffer.array(),0,buffer.limit()));
                        sc.write(buffer);
                    }
                }
               se.selectedKeys().clear();
        }
    }

    private static ByteBuffer[] get(String heads) {
        ByteBuffer[] bbs = new ByteBuffer[heads.length];
        for (int i = 0; i < bbs.length; i++) {
            String s = heads[i];
            bbs[i] = ByteBuffer.allocateDirect(1024);
            bbs[i].put(s.getBytes());
            bbs[i].flip();
        }
        return bbs;
    }
}
有机会再好好研究它们之间的更加具体的用法,以上的只是一个简单的,能互连的一个例子.